<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-alert show-icon title="注意: 只允许为第三级分类设置相关参数" type="warning" :closable="false"></el-alert>
      <!-- 级联选择器 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <el-cascader
            v-model="selectedKeys"
            :options="cateList"
            :props="cateProps"
            @change="cateChanged"
            clearable
            style="margin-left: 10px;"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- Tabs标签页 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 动态参数表单 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加参数</el-button>
          <!-- 动态列表 -->
          <el-table :data="manyTableData" style="width: 100%" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 生成动态编辑标签（可进行文本框和标签的动态切换） -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column prop="attr_name" label="参数名称"></el-table-column>
            <el-table-column label="操作">
              <template width="300px" slot-scope="scope">
                <!-- 编辑功能@click="showEditDialog(scope.row.id)" -->
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <!-- 删除功能 -->
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 静态参数表单 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加属性</el-button>
          <!-- 静态列表 -->
          <el-table :data="onlyTableData" style="width: 100%" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 生成静态编辑标签（可进行文本框和标签的静态切换） -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column prop="attr_name" label="属性名称"></el-table-column>
            <el-table-column label="操作">
              <template width="300px" slot-scope="scope">
                <!-- 编辑功能@click="showEditDialog(scope.row.id)" -->
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <!-- 删除功能 -->
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加参数对话框 -->
        <el-dialog
          :title="'添加'+TitleText"
          :visible.sync="addDialogVisible"
          width="50%"
          @close="addDialogClosed"
        >
          <!-- 动态参数表单验证框 -->
          <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="80px">
            <el-form-item :label="TitleText" prop="attr_name">
              <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
          </el-form>
          <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
          </span>
        </el-dialog>

        <!-- 修改参数对话框 -->
        <el-dialog
          :title="'修改'+TitleText"
          :visible.sync="editDialogVisible"
          width="50%"
          @close="editDialogClosed"
        >
          <!-- 动态参数表单验证框 -->
          <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="80px">
            <el-form-item :label="TitleText" prop="attr_name">
              <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
          </el-form>
          <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
          </span>
        </el-dialog>
      </el-tabs>
    </el-card>
  </div>
</template>
<script>
export default {
  data() {
    return {
      //级联选择器双向绑定的数据
      selectedKeys: [],
      //级联选择器下拉菜单数据
      cateList: [],
      //级联选择器的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      //设置默认显示的列表是动态参数列表
      activeName: 'many',
      //存储动态参数的数据
      manyTableData: [],
      //存储静态属性的数据
      onlyTableData: [],
      //设置添加动态参数或静态属性的对话框的显示与隐藏
      addDialogVisible: false,
      editDialogVisible: false,
      //存储添加动态参数或静态属性双向绑定数据
      addForm: {
        attr_name: ''
      },
      //存储修改动态参数或静态属性双向绑定数据
      editForm: {
        attr_name: ''
      },
      attr_id: 0,
      //存储添加动态参数或静态属性校验规则
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created() {
    this.getCatesList()
  },
  methods: {
    //获取级联选择框中分类的数据
    async getCatesList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200)
        return this.$message.error('获取商品分类失败')

      this.cateList = res.data
      //   console.log(this.cateList);
    },
    //当选定级联选择器的选项时触发获取参数数据
    cateChanged() {
      this.getParamsDate()
    },
    //获取你选定商品分类的id的参数数据
    async getParamsDate() {
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // console.log(this.selectedKeys);
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: {
            sel: this.activeName
          }
        }
      )
      //foreach对数据循环遍历，以及给每一项添加单独的inputVisible和inputValue
      res.data.forEach(item => {
        //解决空字符串被split分割后生成一个空格数组，有空字符串数组会生成空白标签的问题
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        //动态编辑标签的文本输入框模式的显示与隐藏
        item.inputVisible = false
        //动态编辑标签的文本输入框模式双向绑定的值
        item.inputValue = ''
      })
      console.log(res.data)
      if (res.meta.status !== 200)
        return this.$message.error('获取参数列表失败')
      if (this.activeName == 'many') {
        this.manyTableData = res.data
      }
      if (this.activeName == 'only') {
        this.onlyTableData = res.data
      }
    },
    //当切换标签页的时候获取参数数据
    handleTabClick() {
      this.getParamsDate()
    },
    //关闭添加参数对话框
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    //关闭修改参数对话框
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    //添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 201)
          return this.$message.error('添加参数失败！')
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsDate()
      })
    },
    //显示修改参数对话框，同时获取当前行参数的数据，将数据赋值给双向绑定的editForm
    async showEditDialog(id) {
      this.editDialogVisible = true
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${id}`,
        {
          params: {
            attr_sel: this.activeName
          }
        }
      )
      if (res.meta.status !== 200) return this.$message.error('获取参数失败！')
      this.editForm = res.data
    },
    //修改参数
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 200)
          return this.$message.error('修改参数失败！')
        this.$message.success('修改参数成功！')
        this.editDialogVisible = false
        this.getParamsDate()
      })
    },
    //删除参数
    async removeParams(id) {
      console.log(id)

      const confirmResult = await this.$confirm(
        '此操作将永久删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      if (confirmResult !== 'confirm') return this.$message.info('已取消删除！')
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${id}`
      )
      if (res.meta.status !== 200) return this.$message.error('删除参数失败！')
      this.$message.success('删除参数成功！')
      this.getParamsDate()
    },
    //对动态编辑标签进行回车和获取焦点时触发的事件
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVal(row)
    },
    //实现修改参数
    async saveAttrVal(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.meta.status !== 200)
        return this.$message.error('修改参数项失败！')
      this.$message.success('修改参数项成功！')
    },
    //实现点击动态编辑标签按钮，标签变成文本框
    showInput(row) {
      row.inputVisible = true
      //$nextTick方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    //删除标签项
    async handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVal(row)
    }
  },
  //计算机属性
  computed: {
    //设置按钮的隐藏与显示
    //如果级联选择器选择了第三级分类参数，就返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedKeys.length !== 3) {
        return true
      }
      return false
    },
    //如果级联选择器选择了第三级分类参数，就返回第三级分类参数的id，否则返回空
    cateId() {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2]
      }
      return null
    },
    //实现动态参数列表和静态属性列表公用一个对话框
    TitleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>
<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>


